package class22;

/**
 * @author zhangchaoliang
 * create 2022
 */
public class RotateMatrix {

    public static void rotate(int[][] matrix){
        int a = 0;
        int b = 0;
        int c = matrix.length-1;
        int d = matrix[0].length - 1;
        while (a<c){
            rotateEdge(matrix,a++,b++,c--,d--);
        }
    }

    public static void rotateEdge(int[][] m,int a,int b,int c,int d){
        int tmp = 0;
        for (int i= 0;i<d-b;i++){
            tmp = m[a][b+i];
            m[a][b+i] = m[c-i][b];
            m[c-i][b]=m[c][d-i];
            m[c][d-i]=m[a+i][d];
            m[a+i][d] = tmp;
        }
    }

    public static void printMatrix(int[][] matrix){
        for (int i=0;i!=matrix.length;i++){
            for (int j=0;j!=matrix[0].length;j++){
                System.out.print(matrix[i][j]+ " ");
            }
            System.out.println();
        }
    }

    public static void main(String[] args) {
        int[][] matrix = {
                { 1, 2, 3, 4 },
                { 5, 6, 7, 8 },
                { 9, 10, 11, 12 },
                { 13, 14, 15, 16 } };
        printMatrix(matrix);
        rotate(matrix);
        System.out.println("=========");
        printMatrix(matrix);
    }
}
